Pressure-alarm gage.



P. SGHUBERT.

PRESSURE ALARM GAGE.

APPLICATION FILED FEB.26, 191 2.

1,074,137. Patented Sept. 30, 1913.

II A r b v E- -IHIIIIII E a. Im-L '15 2.1-: I A I I m W /5mm /7 I7WITNESSES: INVENTOR ATTORN EY UNITED STATES PATENT onn on.

FREDERICK SGHUIBERT, OF SELLERSVILLE, IENNSYLVANIA.

. PRESSURE-ALARM GAGE.

Specification of Letters Patent. Patented Sept. 30, 1913- Applicationfiled February 26, 1912. Serial No. 680,036.

To all whom it may concern:

Be it known that I, FREDERICK SCHU- BERT, a citizen of the UnitedStates, and resident'of Sellersville, in thefcounty of Bucks and Stateof Pennsylvania, have invented certain new and useful Improvements inPressure-Alarm Gages, of which the following isv a specification.

This invention relates to electrical alarm gages for indicating high andlow pres sure in a steam boiler and the like, the ob ject being toproduce such a gage in which the adjustment is inclosed to preventtampering by any unauthorized person.

A further object is to provide simple electrical contacts for sendingtwo distinct alarms to a point distant from the boiler, which contactswill not interfere with the correct indication of the pressure on thedial.

The accompanying drawings illustrate the preferred embodiment of theinvention, but it is understood that changes, variations, andmodifications can be resorted to which come within the scope of theclaims hereunto appended.

In the drawings, wherein like reference characters denote correspondingparts in the several views, Figure 1 is a front elevation of the alarmgage, the movement standing-at low pressure, the bezel being broken awayto show construction, and the case also broken away to show insulationof one of the wire connecting or binding posts; the dash and dot linesshow the position of the Bourdon-spring tube, link and sector whenindicating high-pressure.

' Fig.2 is a sectional-,view on line mw of Fig. 1, the Bourdon-springtube being broken away, for clearness of illustrat on and Fig. 3 is anenlarged side elevation of one of the electrical contact posts, as

mounted complete in the gage case, shown in section, the insulated blockbeing broken away at the screws.

The C3.%,'1,.1S of the usual construction, but I prefer to use a bezelor ring, 2, with a hinge, 3, on one side and a staple, 4, at a pointdiametrically opposite sald staple alining with a similar staple, 1, onthe case for the purpose of fastening with a lock seal 5.. A glass 2 isfastened in the ring 2.

The pressure indicating movement consists of the usual Bourdon-tubespring, 6,

link, 7, and sector, 8, thesector having two contact points, 8* and 8,for the purpose hereinafter specified. A curved slot, 8, permitsadjustment of the link, this being a modification of the curvedadjustment shown in Letters Patent No. 831,191 issued to me on September18th, 1906.

The movement is mounted'in a frame 9, as usual, and consists of apinion, 10, on the shaft, 11, upon which the pointer, 12 is placed, thearc of the sector is provided with teeth on its periphery which engagethe pinion, 11 is a coiled spring.

At a suitable point above the movement an electrical contact post forhigh pressure 13, is positioned,- the post having a flat, circular base,13, which is pressed down by a metal spring la, bifurcated at the postand held in place by screws, 15, 15, upon an insulated plate, 16, saidplate being fastened to the case by screws, 17, as shown. in Fig. 3. Thepost, 13, may be slightly flattened on one side and a thin flat sprlng,18, attached to it by a screw, 18, or in any preferred manner; a smallstrip of platinum 18 or other non-corroding metal may be fastened on theface of said spring so as to stand in the path of the contact point 8(or 8*) of the sector, the path being indicated by a dotted line in Fig.3. a

A similar electrical contact post, 19, for low pressure is an exactduplicate of the one described above, and is placed in the case so thatthe spring 18 will present its side to and stand in the path of the-.same manner as the high pressure post,

the difference being that the low pressure post and spring is connectedwith a binding post 25, insulated from the case I, by arubber bushingand washer 26, 26 respectively and by an insulated wire, 27 and the highpressure post andspring is connected by an insulated wire 28 to abinding post 29, also insulated from the case by a suitable insulator30. The binding post, 31 at the top of the case is directly connectedor, has metallic connections with said case whereby one pole of abattery-not shown-will energize 1t, and,

tended,as shown by dot and dash lines in- Fig. 1,the pointer shows thepressure on the dial. A screw driver is inserted in the slot, 18 of thepost 13 whereby itis rotatively adjusted so that the contact spring 18will stand at the desired pointor pressureat which an alarm is to besounded say as an illustration, 100 pounds pressure as a maximum highpressure; the other contact post, 19, is then adjusted for a lowpressure limit, say 80 pounds. The slots 13 will each indicate theposition of the contact spring within the case by pointing to the marksaround the high and low pressure openings, and if moved accidentally orpurposely, such change will be noticable at a glance. To prevent afireman or any unauthorized person from resetting these contact posts,the gage is locked up or sealed. The contact springs are Very thin andresilient so that the movement of the sector is not affected when thecontact points 8 or 8 press against either of the springs, thus insuringa correct indication of the pressure.

The bells may be placed in the engineers office, or elsewhere even atconsiderable distance from the boilerif for steam pressureand when thepressure varies from its safe or proper standard-say 90 pounds an alarmwill be sounded on either the high or low bellas the case may be,so thatthe fireman can give prompt attention to the boiler.

In small plants the engineer frequently power or steam will besustained. And if the alarm bells are kept near or in the ofice of afactory, this also has a tendency to'keep the fireman or engineerattentive to his duties, and compels him to keep an even uniformpressure within the set limits.

Such being my invention what I claim 1s:-

1. A. pressure gage, having a Bourdon tube spring, a sector, andindicating means operated by said spring and said sector, all inclosedwithin a case, a plurality of insulated binding posts mounted on saidcase, an electrical alarm comprising an upper and a lower contact pointon the free end of said sector, two independently mounted. postscarrying resilient contact springs for making electrical connectionrespectively with the upper or lower contact points on. said sector,each of said posts being rotatively mounted upon an insulated blockagainst the back of said case,- a binding post directly connected withsaid case, and an independent electrical connection from each of said.adjustable posts to an insulated binding post on the periphery of saidcase, a dial upon which the pressure is indicated, openings in said dialwhich aline with each of said rotatable posts, indicating marks at saidopenings, each of said posts having an indicating mark which indicatesthe position of said contact springs.

2-. In a pressure gage, a movement case containing a Bourdon tubespring,a sector and indicating means operated by said sector, a post rotativelymounted, carrying a spring adapted for contacting with the free upperend of said sector, another post rotatively mounted carrying a springadapted for contacting with the free lower end of said sector, said twoposts being independently mounted upon an insulated block, two insulatedbinding posts mounted on said movement case, having independentconnection with the said two rotatively mounted posts, a dial havingopenings through which the said posts first mentioned are rotativelyadjusted, said movement and said electrical adjustment devices beinginclosed and locked within said case.

Signed at Sellersville in the county of Bucks and State of Pennsylvaniathis 16th day of February A. D. 1912.

FREDERICK SCHUBERT. Witnesses:

FRITZ Brenna, ERNST SoHwINn. V

